Excellent Mechanical Properties of Cu-Hf-Ti-Ta Bulk Glassy Alloys Containing In-Situ Dendrite Ta-based BCC Phase
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- Material Type
- 記事
- Author/Editor
- Chunling QinWei ZhangHisamichi Kimura 他
- Author Heading
- Periodical title
- Materials transactions
- No. or year of volume/issue
- 45(9) 2004.9
- Volume
- 45
- Issue
- 9
- Pages
- 2936～2940
- Publication date of volume/issue (W3CDTF)
- 2004-09
- ISSN (Periodical Title)
- 1345-9678
- ISSN-L (Periodical Title)
- 1345-9678
- Publication (Periodical Title)
- Sendai : The Japan Institute of Metals and Materials ; 2001-
- Place of Publication (Country Code)
- JP
- Text Language Code
- eng
- Subject Heading
- NDLC
- Target Audience
- 一般
- Holding library
- 国立国会図書館
- Call No.
- Z53-J286
- Data Provider (Database)
- 国立国会図書館 : 国立国会図書館雑誌記事索引
- Bibliographic ID (NDL)
- 7088335
- Bibliographic Record Category (NDL)
- 632
- Summary, etc.
- A glassy phase containing high volume fractions (<i>V</i><SUB>f</SUB>) of bcc Ta-based phase was formed in as-cast (Cu<SUB>0.6</SUB>Hf<SUB>0.25</SUB>Ti<SUB>0.15</SUB>)<SUB>94</SUB>Ta<SUB>6</SUB> alloy rods with diameters up to 2 mm. Its <i>V</i><SUB>f</SUB> increased from 9.5 to 11% with increasing rod diameter from 1 to 2 mm. The <i>in-situ</i> bcc phase has a dendritic morphology with a size of about 10 μm and its size tends to increase with increasing <i>V</i><SUB>f</SUB>. The bcc phase has analytical compositions of 1.4 at% Cu, 7.6 at% Ti and 91.0 at% Ta. The lattice parameter of the bcc phase is 3.306 nm which approximates to that of Ta metal. The thermal stability of the remaining glassy matrix remains unchanged in coexistence with the bcc phase. The mixed structure is presumed to be formed by the primary precipitation of ductile dendritic bcc phase, followed by the solidification of the remaining liquid to glassy phase. The Young's modulus (<i>E</i>), yield strength (σ<SUB>y</SUB>), true compressive fracture strength (σ<SUB>t,f</SUB>) and true plastic strain (ε<SUB>p</SUB>) were 104 GPa, 2125 MPa, 2100 MPa and 0.34, respectively, for the φ2 mm rod with 11% <i>V</i><SUB>f</SUB>. The σ<SUB>y</SUB> and σ<SUB>t,f</SUB> are higher than those (2010 MPa and 2005 MPa) for the Cu<SUB>60</SUB>Hf<SUB>25</SUB>Ti<SUB>15</SUB> glassy alloy rod with a diameter of 2 mm. Especially, the ε<SUB>p</SUB> for the (Cu<SUB>0.6</SUB>Hf<SUB>0.25</SUB>Ti<SUB>0.15</SUB>)<SUB>94</SUB>Ta<SUB>6</SUB> mixed structure alloy is dramatically enhanced in comparison with that (ε<SUB>p</SUB> = 0.016) for Cu<SUB>60</SUB>Hf<SUB>25</SUB>Ti<SUB>15</SUB> single phase alloy. The enhancement of σ<SUB>y</SUB>, σ<SUB>t,f</SUB> and ε<SUB>p</SUB> in the mixed structure of glassy and bcc phase for the new Cu-based system is promising for future uses as a new type of high-strength bulk glassy alloy.
- DOI
- 10.2320/matertrans.45.2936
- Access Restrictions
- インターネット公開
- Data Provider (Database)
- 科学技術振興機構 : J-STAGE
- Summary, etc.
- A glassy phase containing high volume fractions (<i>V</i><SUB>f</SUB>) of bcc Ta-based phase was formed in as-cast (Cu<SUB>0.6</SUB>Hf<SUB>0.25</SUB>Ti<SUB>0.15</SUB>)<SUB>94</SUB>Ta<SUB>6</SUB> alloy rods with diameters up to 2 mm. Its <i>V</i><SUB>f</SUB> increased from 9.5 to 11% with increasing rod diameter from 1 to 2 mm. The <i>in-situ</i> bcc phase has a dendritic morphology with a size of about 10 μm and its size tends to increase with increasing <i>V</i><SUB>f</SUB>. The bcc phase has analytical compositions of 1.4 at% Cu, 7.6 at% Ti and 91.0 at% Ta. The lattice parameter of the bcc phase is 3.306 nm which approximates to that of Ta metal. The thermal stability of the remaining glassy matrix remains unchanged in coexistence with the bcc phase. The mixed structure is presumed to be formed by the primary precipitation of ductile dendritic bcc phase, followed by the solidification of the remaining liquid to glassy phase. The Young's modulus (<i>E</i>), yield strength (σ<SUB>y</SUB>), true compressive fracture strength (σ<SUB>t,f</SUB>) and true plastic strain (ε<SUB>p</SUB>) were 104 GPa, 2125 MPa, 2100 MPa and 0.34, respectively, for the φ2 mm rod with 11% <i>V</i><SUB>f</SUB>. The σ<SUB>y</SUB> and σ<SUB>t,f</SUB> are higher than those (2010 MPa and 2005 MPa) for the Cu<SUB>60</SUB>Hf<SUB>25</SUB>Ti<SUB>15</SUB> glassy alloy rod with a diameter of 2 mm. Especially, the ε<SUB>p</SUB> for the (Cu<SUB>0.6</SUB>Hf<SUB>0.25</SUB>Ti<SUB>0.15</SUB>)<SUB>94</SUB>Ta<SUB>6</SUB> mixed structure alloy is dramatically enhanced in comparison with that (ε<SUB>p</SUB> = 0.016) for Cu<SUB>60</SUB>Hf<SUB>25</SUB>Ti<SUB>15</SUB> single phase alloy. The enhancement of σ<SUB>y</SUB>, σ<SUB>t,f</SUB> and ε<SUB>p</SUB> in the mixed structure of glassy and bcc phase for the new Cu-based system is promising for future uses as a new type of high-strength bulk glassy alloy.
- DOI
- 10.2320/matertrans.45.2936
- Access Restrictions
- インターネット公開
- Related Material (URI)
- Is Referenced By
- Retraction:Nanoindentation Characteristics of <I>In-Situ</I> Formed Cu–Hf–Ti–Ag–Ta Bulk Metallic Glass CompositesUnusual Plasticity of the Particulate-Reinforced Cu-Zr-Based Bulk Metallic Glass CompositesMicrostructure and Mechanical Properties of (Zr<SUB>0.5</SUB>Cu<SUB>0.4</SUB>Al<SUB>0.1</SUB>)<SUB>100−<I>x</I></SUB>Ta<I><SUB>x</SUB></I> Bulk Metallic Glass CompositesHigh Specific Strength and Improved Ductility of Bulk (Mg<SUB>0.65</SUB>Cu<SUB>0.25</SUB>Gd<SUB>0.1</SUB>)<SUB>100−<I>x</I></SUB>Ti<I><SUB>x</SUB></I> Metallic Glass CompositesDevelopments and Applications of Bulk Glassy Alloys in Late Transition Metal Base System
- References
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- Data Provider (Database)
- 国立情報学研究所 : CiNii Research
- Original Data Provider (Database)
- Japan Link Center雑誌記事索引データベースCrossrefCiNii ArticlesCiNii ArticlesCiNii ArticlesCrossrefCrossrefCrossrefCrossrefCrossref
- Bibliographic ID (NDL)
- 7088335
- NAID
- 1300044525923001885114410013580157